JP2011007306A - Repairing method for piping - Google Patents

Repairing method for piping Download PDF

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JP2011007306A
JP2011007306A JP2009153516A JP2009153516A JP2011007306A JP 2011007306 A JP2011007306 A JP 2011007306A JP 2009153516 A JP2009153516 A JP 2009153516A JP 2009153516 A JP2009153516 A JP 2009153516A JP 2011007306 A JP2011007306 A JP 2011007306A
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pipe
reinforcing
hole
divided
resin
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Masato Ueno
正人 上野
Yukio Katsuhata
幸男 勝畑
Kazuhiro Wakabayashi
和広 若林
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Tokyo Energy and Systems Inc
Tokyo Electric Power Company Holdings Inc
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Tokyo Electric Power Co Inc
Tokyo Energy and Systems Inc
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Abstract

PROBLEM TO BE SOLVED: To provide easy and rigid repairing without stopping hydraulic transport in regard to hydraulic transport piping wherein it is hard to stop hydraulic transport.SOLUTION: In the repair method for piping, repairing can be carried out by installing a reinforcement pipe 40 and filling and hardening reactive hardening type resin in its interior in piping 20 having thinning or a through hole and needing repair. By using the reinforcement pipe 40 made of metal, a thickness of the reactive hardening type resin can be reduced, and repairing can be carried out even in a wide range of work environments such as a narrow work place or the like.

Description

本発明は、流体用配管の腐食その他に起因する貫通孔や、減肉部の補修方法に関するものである。   The present invention relates to a method for repairing a through hole or a thinned portion caused by corrosion of a fluid pipe or the like.

プラント設備にはガスや水、油などの流体を輸送するための配管が多数敷設されているが、長期間使用していると配管内外部が腐食、磨耗し、その結果減肉などが生じる。減肉が生じると、場合によっては配管に亀裂等が生じて内部流体が漏洩するような不具合が生じる。   Many pipes for transporting fluids such as gas, water, and oil are laid in the plant equipment, but if used for a long period of time, the inside and outside of the pipes corrode and wear, resulting in thinning. When the thinning occurs, in some cases, a crack or the like is generated in the pipe, causing a problem that the internal fluid leaks.

配管を取り替えずにこれらを補修する方法としては、特許文献1に開示されるようなものがある。   As a method of repairing these without replacing the piping, there is a method disclosed in Patent Document 1.

この補修方法は、配管外周に設置した型枠に液状の反応硬化型樹脂を充填して固化し、その後型枠をはずして樹脂補強層を形成するものであり、さまざまな径の配管の補修が可能であるとしている。   This repair method is to fill the mold placed on the outer periphery of the pipe with liquid reaction-curing resin and solidify it, and then remove the mold to form a resin reinforcement layer. Pipes of various diameters can be repaired. It is possible.

特開平1−210688号公報Japanese Patent Laid-Open No. 1-210688

上記の配管補修方法では、補修後の配管強度を反応硬化型樹脂の引っ張り強度によって担保しているが、一般的に樹脂の引っ張り強度は金属のそれの10分の1程度であるため、流体が高圧で輸送されるような配管の補修の際には、補強樹脂の厚さが大きくなり、補修対象箇所が狭隘部である場合などに、施工できないというようなことが生じる。   In the above pipe repair method, the pipe strength after repair is secured by the tensile strength of the reaction-curing resin, but generally the tensile strength of the resin is about one-tenth that of metal, so the fluid When repairing a pipe that is transported at a high pressure, the thickness of the reinforcing resin is increased, and when the repair target portion is a narrow portion, it may not be possible to perform the construction.

また、反応硬化型樹脂の端部近傍に貫通亀裂がある場合には、亀裂から漏れる流体が配管と樹脂補強層の隙間(界面)を伝って外部に漏洩する現象が懸念される。従って特許文献1に開示された技術は、接着界面に沿った漏洩について十分な対策がされているとはいい難い。   Moreover, when there is a through crack near the end of the reaction curable resin, there is a concern that a fluid leaking from the crack may leak to the outside through a gap (interface) between the pipe and the resin reinforcing layer. Therefore, it is difficult to say that the technique disclosed in Patent Document 1 has sufficient countermeasures for leakage along the adhesion interface.

発明者は上記課題について鋭意検討を行い、樹脂部の厚さを肥大させず、また樹脂部の接着界面に沿った漏洩を効率的に防止しうる補修方法を発明するに至った。   The inventor diligently studied the above-mentioned problems, and came to invent a repair method capable of efficiently preventing leakage along the adhesive interface of the resin part without increasing the thickness of the resin part.

すなわち、本発明は以下のとおりである。   That is, the present invention is as follows.

流体輸送配管の外部に前記流体輸送配管外径よりも大きい内径を有する補強管を設置する工程と、前記補強管の内面と前記流体輸送配管の外面との間の空間に液状の反応硬化型樹脂を充填する工程と、前記充填した樹脂を硬化させる工程を含み、前記流体輸送配管の外周に樹脂部および前記補強管からなる補強部を形成することを特徴とする配管の補修方法である。 A step of installing a reinforcing pipe having an inner diameter larger than the outer diameter of the fluid transport pipe outside the fluid transport pipe; and a liquid reaction-curable resin in a space between the inner surface of the reinforcing pipe and the outer surface of the fluid transport pipe And a step of curing the filled resin, and forming a reinforcing portion made of a resin portion and the reinforcing tube on the outer periphery of the fluid transport piping.

前記補強管を設置する工程は、前記補強管を長手方向に沿って複数に分割された、分割管を前記配管へかぶせて前記分割管の合わせ部を接合する手順と、前記分割管のあわせ部を接合した前記補強管を前記配管と略同軸に固定する手順を含んだことを特徴とする配管の補修方法である。 The step of installing the reinforcing pipe is divided into a plurality of the reinforcing pipes along the longitudinal direction, the procedure of covering the dividing pipe over the pipe and joining the mating part of the dividing pipe, and the fitting part of the dividing pipe A method of repairing a pipe, comprising a step of fixing the reinforcing pipe joined to the pipe substantially coaxially with the pipe.

さらに前記補強管を設置する工程は、前記補強管を長手方向に沿って複数に分割された前記分割管を前記配管へかぶせる手順と、前記分割管の合わせ部の一つが前記配管の外面から遠ざかるように、前記分割管を前記配管に対して偏軸させて固定する手順と、前記配管の外面から遠ざけた前記分割管の合わせ部を溶接する手順と、前記固定手順と前記溶接手順を残りの前記分割管の合わせ部をすべて溶接するまで繰り返す手順と、前記分割管のあわせ部を溶接した前記補強管を前記配管と略同軸に固定する手順を含んだことを特徴とする。 Further, the step of installing the reinforcing pipe includes the step of covering the pipe with the divided pipe divided into a plurality of the reinforcing pipes along the longitudinal direction, and one of the joining portions of the divided pipes being moved away from the outer surface of the pipe. As described above, the procedure for fixing the split pipe by decentering with respect to the pipe, the procedure for welding the mating portion of the split pipe away from the outer surface of the pipe, the fixing procedure and the welding procedure are the remaining steps. The method includes a procedure that repeats until all the mating portions of the split pipe are welded, and a procedure that fixes the reinforcing pipe welded to the mating portion of the split pipe substantially coaxially with the pipe.

前記配管に貫通孔が存在する場合に、前記貫通孔から前記補強管端部への最短距離が以下の式を満たすように前記補強管の位置と長さを設定することを特徴とする。 When the through hole exists in the pipe, the position and length of the reinforcing pipe are set so that the shortest distance from the through hole to the reinforcing pipe end satisfies the following formula.

Figure 2011007306
Figure 2011007306
Figure 2011007306
Figure 2011007306

前記配管に貫通孔が存在する場合に、前記配管の内圧を減じる工程と、前記貫通孔に栓を打ち込む工程を前記補強管を設置する工程の前段に含むとともに、前記樹脂を硬化する工程の後に前記配管の圧力を復帰させる工程を含んだことを特徴とする。   After the step of reducing the internal pressure of the pipe and the step of driving a plug into the through hole in the previous stage of the step of installing the reinforcing pipe and the step of curing the resin when the through hole exists in the pipe The step of returning the pressure of the pipe is included.

前記配管が上下方向に設置されている場合、前記液状の反応硬化型樹脂を充填する工程において前記補強管の端部に追加型枠を設置する手順を含むとともに、前記樹脂の硬化後には、前記追加型枠を取り除くとともに、前記樹脂部に前記配管から前記補強管へ上から下へ向かって径の大きくなるテーパーを形成させる工程を含むことを特徴とする。   When the pipe is installed in the vertical direction, the method includes a step of installing an additional formwork at an end of the reinforcing pipe in the step of filling the liquid reaction-curing resin, and after the resin is cured, The method further includes removing the additional mold and forming a taper having a diameter increasing from top to bottom from the pipe to the reinforcing pipe.

前記配管が横方向に設置されている場合、前記補強管は離間した2以上の穴を有し、一方を充填孔、他方を空気抜き穴とし、前記反応硬化型樹脂を充填する工程は、前記空気抜き穴を上方に配置させた状態で前記樹脂を前記充填孔から充填する手順を含むことを特徴とする。   When the pipe is installed in the lateral direction, the reinforcing pipe has two or more spaced holes, one of which is a filling hole and the other of which is an air vent hole, and the step of filling the reaction curable resin includes the air vent. The method includes a step of filling the resin from the filling hole in a state in which the hole is disposed above.

本発明の配管の補修方法によれば、樹脂部を厚くとることなく、補強部に十分な引っ張り強度をもたせられるとともに樹脂部接着界面に沿った漏洩を効率的に防止し、また、可燃性ガスの配管に貫通孔が生じた場合においても配管内の減圧のみで配管内の空気置換等、時間がかかる工程を経ることなく施工することが可能になった。   According to the pipe repair method of the present invention, the reinforcing portion can be provided with sufficient tensile strength without causing the resin portion to be thick, and the leakage along the resin portion bonding interface can be effectively prevented. Even when a through-hole is formed in this pipe, it has become possible to perform construction without passing through time-consuming processes such as air replacement in the pipe only by reducing the pressure in the pipe.

補修された配管の断面図Cross section of repaired piping 火力発電所における天然ガス配管系統図Natural gas piping system diagram in a thermal power plant 配管補修方法フロー図Piping repair method flow chart 栓打ち込み処理模式図Schematic diagram of plug-in process 接着面積の概念図Conceptual diagram of bonding area 分割管Split tube 分割管の固定状況図Split pipe fixing situation diagram 分割管の偏軸固定状況図Figure of split shaft fixing situation of split pipe 追加型枠設置図Additional formwork installation drawing 樹脂の充填形態図Resin filling form 横方向配管への樹脂充填形態図Resin filling form for horizontal piping

以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。かかる実施形態に示す寸法、材料、その他具体的な数値などは、発明の理解を容易とするための例示に過ぎず、特に断る場合を除き、本発明を限定するものではない。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified.

図2は、本実施例の補修対象である、火力発電設備における天然ガス配管の系統図である。本実施例においては、2基のLNGタンク(111、112)に貯蔵されている液化天然ガスを気化器(121、122)で気化して2つの発電ユニットへ供給している。天然ガスの流量や圧力は、バルブ131〜139によって制御される。   FIG. 2 is a system diagram of natural gas piping in a thermal power generation facility, which is a repair target of the present embodiment. In this embodiment, the liquefied natural gas stored in the two LNG tanks (111, 112) is vaporized by the vaporizer (121, 122) and supplied to the two power generation units. The flow rate and pressure of natural gas are controlled by valves 131-139.

図3は本発明にかかる配管補修方法の実施形態を示すフロー図である。   FIG. 3 is a flowchart showing an embodiment of the pipe repair method according to the present invention.

ステップS01では配管の状況を確認し、減肉箇所と貫通孔の有無を判断する。貫通孔がある場合には、配管内圧を減圧(S03)した上で貫通孔処理(栓打ち込み等)を行い(S04)貫通孔を塞いだ上で、補強管の設置へ進む。   In step S01, the status of the piping is confirmed, and the presence or absence of a thinned portion and a through hole is determined. If there is a through-hole, the internal pressure of the pipe is reduced (S03), a through-hole treatment (plugging or the like) is performed (S04), the through-hole is closed, and the process proceeds to installation of the reinforcing pipe.

ステップS05では補強管の長さを算定し、配管の補強対象部位に設置(S06)する。後述するが補強管は2つ割りになっているため設置にあたってはこれを接合する。なお、補強管は複数分割であればその用が足りるため、2つ割りに限定されるものではない。   In step S05, the length of the reinforcement pipe is calculated and installed in the reinforcement target portion of the pipe (S06). As will be described later, since the reinforcing pipe is divided into two parts, they are joined at the time of installation. In addition, since the use is sufficient if the reinforcement pipe is divided into a plurality of parts, it is not limited to two.

ステップS07では、樹脂部に水だまり防止用のテーパーが必要かどうか判断する。必要な場合にはステップS08へ進み追加型枠を設置する。   In step S07, it is determined whether or not the resin portion needs a taper for preventing puddles. If necessary, the process proceeds to step S08 to install an additional formwork.

ステップS09でエポキシ樹脂を充填・硬化する。ステップS07で樹脂部にテーパーが必要であると判断した場合には、エポキシ樹脂硬化後に追加型枠を取り外し(S10)、テーパーを成型(S11)する。   In step S09, the epoxy resin is filled and cured. If it is determined in step S07 that the resin portion needs to be tapered, the additional mold is removed after the epoxy resin is cured (S10), and the taper is molded (S11).

配管内圧を減圧した場合には、それを復帰させて(S14,S15)作業を終了する。   If the internal pressure of the pipe is reduced, it is restored (S14, S15) and the operation is terminated.

以下に、上下方向に敷設された配管の補修方法について、個々の工程の詳細を説明する。   Below, the detail of each process is demonstrated about the repair method of piping laid in the up-down direction.

配管の内圧を減じる工程を、ステップS03において以下のように説明する。   The process of reducing the internal pressure of the piping will be described as follows in step S03.

図2において、部位Xに貫通孔があった場合には、まず、バルブ131、133、135、137を閉止してガスの流れを止め、バルブ139を開いて流体の圧力を下げ、所定の圧力となったところで、バルブ139を閉止する。 In FIG. 2, when there is a through hole in the part X, first, the valves 131, 133, 135, and 137 are closed to stop the flow of gas, and the valve 139 is opened to lower the fluid pressure. Then, the valve 139 is closed.

ステップS04は貫通孔に栓を打ち込む工程である。図4は配管の貫通孔に栓を打ち込み処理する様子を説明する図である。図4において、20は補修対象である配管であり、これの溶接部分に貫通孔Xがある。この貫通孔Xに鉛棒23をハンマー24で打ち込み、リークチェックを行う。リークが無いようであれば、速硬化型補修材(金属粉)をXの付近に埋め込み、下地処理を行う。このように、栓打ち込み工法は流体の内圧が完全に下がらない状態に有っても施工は可能である。
また、図4は隅肉溶接部貫通孔の例であるが、一般的な配管外表面に於ける腐食貫通孔の場合は流体の内圧を完全に下げた後に、速硬化型補修材(金属粉)埋め込みや、ビニールフィルム貼付等により開口部からのエポキシ樹脂漏出を防止する方法もある。
Step S04 is a step of driving a plug into the through hole. FIG. 4 is a diagram for explaining a state in which a stopper is driven into the through hole of the pipe. In FIG. 4, 20 is a pipe to be repaired, and a through hole X is present at a welded portion thereof. A lead rod 23 is driven into the through hole X with a hammer 24 to perform a leak check. If there is no leak, a fast-curing repair material (metal powder) is embedded in the vicinity of X, and the base treatment is performed. As described above, the plug driving method can be applied even when the internal pressure of the fluid is not completely lowered.
FIG. 4 shows an example of a fillet welded portion through hole. In the case of a corrosion through hole on a general outer surface of a pipe, after the internal pressure of the fluid is completely lowered, a fast-curing repair material (metal powder) ) There is also a method of preventing leakage of epoxy resin from the opening by embedding or attaching a vinyl film.

補強管を設置する工程において、ステップS05では配管に設置すべき補強管の長さを算定する。図5は接着面積の概念図である。a図において、61は配管壁、62が貫通孔であり、配管壁の外側表面に接するようにエポキシ樹脂63が補修材として接着されている。なお、図示しないがエポキシ樹脂63の外側には補強管が設置される。   In the step of installing the reinforcing pipe, in step S05, the length of the reinforcing pipe to be installed in the pipe is calculated. FIG. 5 is a conceptual diagram of the bonding area. In FIG. a, 61 is a pipe wall, 62 is a through hole, and an epoxy resin 63 is bonded as a repair material so as to be in contact with the outer surface of the pipe wall. Although not shown, a reinforcing tube is installed outside the epoxy resin 63.

貫通孔62において、流体からエポキシ樹脂が受ける力がエポキシ樹脂の配管壁61への接着力を上回ると、エポキシ樹脂が剥離してしまう。この力の関係を示すのが、配管を周方向に展開し外側からみたb図である。ここで、貫通孔62を中心に、貫通孔62からエポキシ樹脂端部64の最短距離を半径とする仮想的な円65を考え、
仮想円の面積×面積あたりエポキシ樹脂接着力>貫通孔面積×配管内圧
の関係であれば、栓打ち込みに不具合があってもエポキシ樹脂が剥離しないと考えられる。
If the force that the epoxy resin receives from the fluid exceeds the adhesive force of the epoxy resin to the piping wall 61 in the through hole 62, the epoxy resin is peeled off. The relationship of this force is shown in FIG. Here, a virtual circle 65 having a radius of the shortest distance from the through hole 62 to the epoxy resin end portion 64 around the through hole 62 is considered.
If the relationship of the area of the virtual circle × the epoxy resin adhesive force per area> the through hole area × the pipe internal pressure, it is considered that the epoxy resin does not peel off even if there is a malfunction in the stopper.

ここで、エポキシ樹脂全体を展開した長方形ABCDでなく、仮想円65を接着面積としているのは、エポキシ樹脂と配管表面の界面を流体が漏洩しようとする力は全方向に均等にかかることを考慮しているからである。たとえば、長方形ABCDが剥離しないために必要とされる接着面積ぎりぎりであった場合に、流体の圧力は全方向に均等にかかるため、流体が漏洩しようとする力に等しい接着面積をもつ仮想円65の半径に満たない短辺から流体が漏洩し、剥離が始まることが懸念される(c図)。 Here, the virtual circle 65 is used as the bonding area instead of the rectangular ABCD in which the entire epoxy resin is developed. This is because the force at which the fluid tries to leak through the interface between the epoxy resin and the pipe surface is equally applied in all directions. Because it is. For example, when the rectangular ABCD is the limit of the bonding area required so that it does not peel off, the pressure of the fluid is evenly applied in all directions, so that the virtual circle 65 having the bonding area equal to the force with which the fluid tries to leak. There is a concern that fluid may leak from a short side that is less than the radius of and the separation starts (Fig. C).

図1は施工後の補修部断面である。図1からもわかるように、エポキシ樹脂の長さは補強管40の長さとほぼ等しくなるため、補強管40の設置位置と長さは式(1)を満たすようにする必要がある。ここで、配管内圧とは該当する配管が耐えなければならない内部流体の最大圧力をさす。 FIG. 1 is a cross section of the repaired part after construction. As can be seen from FIG. 1, since the length of the epoxy resin is substantially equal to the length of the reinforcing tube 40, it is necessary that the installation position and length of the reinforcing tube 40 satisfy the formula (1). Here, the pipe internal pressure refers to the maximum pressure of the internal fluid that the corresponding pipe must withstand.

補強管を設置する工程において、ステップS06では補強管を配管の補修対象部位に設置する。図6は設置前の補強管40を分割した分割管41である。分割管41は2つ割りになった金属管(STPG370 S/40)であり、これを補修対象部位である配管20に被せるようにして設置する。分割管41は溶接にて一体化させるが、配管内流体が不燃物である等、分割管41溶接時の入熱の影響を考慮しなくても良い場合には分割管41設置にあたり、分割管41の固定方法は、配管20との距離を考慮する必要は無い。もちろん、分割管41の接合方法は、溶接と同強度を確保できる方法であれば溶接でなくても良い。   In the step of installing the reinforcing pipe, in step S06, the reinforcing pipe is installed at the repair target part of the pipe. FIG. 6 shows a divided pipe 41 obtained by dividing the reinforcing pipe 40 before installation. The split pipe 41 is a metal pipe (STPG 370 S / 40) divided into two, and is installed so as to cover the pipe 20 which is a repair target part. The split pipe 41 is integrated by welding. However, when it is not necessary to consider the influence of heat input at the time of welding the split pipe 41, such as when the fluid in the pipe is an incombustible material, the split pipe 41 is installed when installing the split pipe 41. The fixing method 41 does not need to consider the distance from the pipe 20. Of course, the joining method of the split pipe 41 may not be welding as long as it can secure the same strength as welding.

図7は分割管41設置にあたり固定治具42(スーパーブリッジ)での固定状況を説明する図である。   FIG. 7 is a diagram for explaining a fixing state with the fixing jig 42 (super bridge) when the dividing pipe 41 is installed.

一方、例えば配管内流体が可燃性ガスの場合、入熱により引火点以上に温度上昇し、万一配管内流体が漏洩した場合、作業環境が危険な状態になる。図8は入熱により配管内流体が影響を受ける場合の分割管41の偏軸固定状態を説明する図である。長手方向に切った断面図がa図、半径方向に切った断面図がb図である。図8にあるように、分割管41の中心軸を、敢えて配管20の中心軸からずらし偏軸させて固定する。その際に、分割管合わせ部411を配管20から遠ざけるようにする。   On the other hand, for example, when the fluid in the pipe is a flammable gas, the temperature rises above the flash point due to heat input, and if the fluid in the pipe leaks, the work environment becomes dangerous. FIG. 8 is a diagram for explaining a state in which the eccentricity of the split pipe 41 is fixed when the fluid in the pipe is affected by heat input. A sectional view cut in the longitudinal direction is a, and a sectional view cut in the radial direction is b. As shown in FIG. 8, the central axis of the divided pipe 41 is deviated from the central axis of the pipe 20 and is deviated. At that time, the divided pipe joining portion 411 is moved away from the pipe 20.

固定後に、遠ざけた分割管合わせ部411を溶接する。分割管合わせ部411の溶接が終わったら、分割管合わせ部411を配管20に近づけ、他方の分割管合わせ部412を配管20から遠ざけるように固定しなおして、再度溶接を行う。この時、入熱を極力低減させるためにリボン状の耐熱クロス44を巻き付ける方法も効果が有る。このような手順を踏むことで、内部流体が可燃性ガスであっても、引火点まで過熱することなく溶接が可能になる。分割管合わせ部411および412の溶接後分割管41はひとつの補強管40となり、配管20と補強管40が同軸となるように固定しなおす。   After fixing, the separated pipe joining portion 411 is welded. When the welding of the divided pipe joining portion 411 is finished, the divided pipe joining portion 411 is brought close to the pipe 20 and the other divided pipe joining portion 412 is fixed again so as to be away from the pipe 20, and welding is performed again. At this time, in order to reduce heat input as much as possible, a method of winding the ribbon-shaped heat-resistant cloth 44 is also effective. By following such a procedure, even if the internal fluid is a flammable gas, welding is possible without overheating to the flash point. After the welding of the divided pipe joining portions 411 and 412, the divided pipe 41 becomes one reinforcing pipe 40 and is fixed again so that the pipe 20 and the reinforcing pipe 40 are coaxial.

ここで、必要に応じて設置後の補修部のエポキシ樹脂部50にテーパーを形成させる工程となり、追加型枠43を設置する(S07、S08)。このテーパーとは、図1の51であり、雨水などがエポキシ樹脂部50にたまることを防いでいる。この部分に水がたまることで、配管20が腐食したりエポキシ樹脂部50が劣化しやすくなるためである。   Here, it becomes a process of forming a taper in the epoxy resin part 50 of the repaired part after installation as necessary, and the additional mold 43 is installed (S07, S08). This taper is 51 in FIG. 1 and prevents rainwater or the like from accumulating on the epoxy resin portion 50. This is because water accumulates in this portion, and the piping 20 is easily corroded and the epoxy resin portion 50 is easily deteriorated.

図9は追加型枠43の設置形態を説明する図である。追加型枠43が補強管40上部の外側に、固定治具42で固定される。本実施例では、補強管40と共通の固定具42で追加型枠43を固定している。追加型枠43のかわりに樹脂が流れ出ないような強度をもつ接着式フィルムテープ等で代用しても良い。   FIG. 9 is a view for explaining an installation form of the additional formwork 43. The additional mold frame 43 is fixed to the outside of the upper portion of the reinforcing tube 40 with a fixing jig 42. In the present embodiment, the additional mold frame 43 is fixed by a fixture 42 common to the reinforcing tube 40. Instead of the additional mold 43, an adhesive film tape having such a strength that the resin does not flow out may be substituted.

ステップS09は、反応硬化型樹脂を充填する工程である。本実施例では、エポキシ樹脂にThreeBond社のスリーロンジ−J−107を使用した。図10はエポキシ樹脂の充填形態を説明する図である。充填に当たっては、補強管40の下部と配管20の間を養生テープ45で養生し、エポキシ樹脂が漏れないようにする。充填後はおよそ7日放置しエポキシ樹脂を硬化させる工程となる(S10)   Step S09 is a step of filling a reactive curable resin. In this example, Three Bond J-107 manufactured by ThreeBond was used as the epoxy resin. FIG. 10 is a diagram illustrating a filling form of the epoxy resin. In filling, the space between the lower part of the reinforcing pipe 40 and the pipe 20 is cured with a curing tape 45 so that the epoxy resin does not leak. After filling, it is a step of curing the epoxy resin by leaving it for about 7 days (S10).

エポキシ樹脂が硬化したら、追加型枠43を取り除き(S11)、エポキシ樹脂部50の露出した部分を削ってテーパー51を形成する(S12)。その後、配管の圧力を復帰させる工程となり、図2のバルブ131、133、135、137を開いて配管内の圧力を復旧させる(S14,S15)   When the epoxy resin is cured, the additional mold 43 is removed (S11), and the exposed portion of the epoxy resin portion 50 is shaved to form a taper 51 (S12). Thereafter, the process returns to the pressure of the pipe, and the valves 131, 133, 135, and 137 in FIG. 2 are opened to restore the pressure in the pipe (S14, S15).

補修された配管の断面図の図1において、配管20の外側にエポキシ樹脂部50補強管40からなる補強部30が設置され、またエポキシ樹脂部50の上部はテーパー51が形成されている。   In FIG. 1 of the cross-sectional view of the repaired pipe, a reinforcing part 30 including an epoxy resin part 50 reinforcing pipe 40 is installed outside the pipe 20, and a taper 51 is formed on the upper part of the epoxy resin part 50.

なお、本発明の配管補修方法は、横向きの配管にも適用可能である。図11は横方向に敷設された配管へのエポキシ樹脂充填を説明する図である。配管20に被せられた補強管40の両側面を養生テープ45で養生し、あらかじめ補強管40に設けられた充填孔461、462のいずれか一方からエポキシ樹脂を充填し硬化させる。もう一方の充填孔は補強管の一番高い位置とすることで空気抜き穴となるので、エポキシ樹脂の充填が容易にでき、空気抜き穴よりエポキシ樹脂が満たされることで、配管20と補強管40の間にエポキシ樹脂が充填されたことの確認も容易である。充填孔461は上部である必要はなく、下部に設置した場合はエポキシ樹脂を充填後、漏れないように充填孔461に栓をすることでより様々な作業環境に対応することができる。また、充填孔461、462は配管の形状にあわせて自由に設定することができるので、複雑な形状の配管においても対応が可能となる。 In addition, the piping repair method of this invention is applicable also to sideways piping. FIG. 11 is a diagram for explaining filling of the epoxy resin into the pipe laid in the horizontal direction. Both side surfaces of the reinforcing pipe 40 placed on the pipe 20 are cured with a curing tape 45, and epoxy resin is filled from one of the filling holes 461 and 462 provided in the reinforcing pipe 40 in advance to be cured. Since the other filling hole is an air vent hole by setting it to the highest position of the reinforcing pipe, the epoxy resin can be easily filled, and the epoxy resin is filled from the air vent hole, so that the pipe 20 and the reinforcing pipe 40 can be filled. It is easy to confirm that the epoxy resin is filled in between. The filling hole 461 does not need to be in the upper part. When the filling hole 461 is installed in the lower part, it is possible to cope with various working environments by plugging the filling hole 461 so as not to leak after filling with the epoxy resin. Further, since the filling holes 461 and 462 can be freely set in accordance with the shape of the pipe, it is possible to cope with a pipe having a complicated shape.

10 天然ガス配管系統
111、112 LNGタンク
121、122 気化器
131〜139 バルブ
20 配管
21 配管台座
22 配管溶接部
23 鉛棒
24 ハンマー
30 補強部
40 補強管
41 分割管
411、412 分割管合わせ部
42 固定治具
43 追加型枠
44 耐火クロス
45 養生テープ
461、462 充填孔
50 エポキシ樹脂部
51 テーパー
61 配管(概念図)
62 貫通孔(概念図)
63 エポキシ樹脂部(概念図)
64 エポキシ樹脂端部
65 仮想円
70 配管減肉部
DESCRIPTION OF SYMBOLS 10 Natural gas piping system 111, 112 LNG tank 121, 122 Vaporizer 131-139 Valve 20 Piping 21 Piping base 22 Piping welding part 23 Lead rod 24 Hammer 30 Reinforcing part 40 Reinforcing pipe 41 Divided pipe 411, 412 Divided pipe matching part 42 Fixing jig 43 Additional mold 44 Fireproof cloth 45 Curing tape 461, 462 Filling hole 50 Epoxy resin part 51 Taper 61 Piping (conceptual diagram)
62 Through hole (conceptual diagram)
63 Epoxy resin part (conceptual diagram)
64 Epoxy resin end 65 Virtual circle
70 Pipe thinning part

Claims (7)

流体輸送配管の外部に前記流体輸送配管外径よりも大きい内径を有する補強管を設置する工程と、
前記補強管の内面と前記流体輸送配管の外面との間の空間に液状の反応硬化型樹脂を充填する工程と、
前記充填した樹脂を硬化させる工程を含み、
前記流体輸送配管の外周に樹脂部および前記補強管からなる補強部を形成することを特徴とする配管の補修方法。
Installing a reinforcing pipe having an inner diameter larger than the outer diameter of the fluid transport pipe outside the fluid transport pipe;
Filling a space between the inner surface of the reinforcing pipe and the outer surface of the fluid transport pipe with a liquid reaction-curable resin;
Curing the filled resin,
A pipe repairing method, comprising: forming a reinforcing part including a resin part and the reinforcing pipe on an outer periphery of the fluid transport pipe.
前記補強管を設置する工程は、
前記補強管を長手方向に沿って複数に分割された分割管を前記配管へかぶせて前記分割管の合わせ部を接合する手順と、
前記分割管のあわせ部を接合した前記補強管を前記配管と略同軸に固定する手順を含んだことを特徴とする、
請求項1に記載する配管の補修方法。
The step of installing the reinforcing pipe includes
A step of covering the pipes with the divided pipes divided into a plurality of the reinforcing pipes along the longitudinal direction and joining the mating portions of the divided pipes;
Characterized in that it includes a step of fixing the reinforcing pipe joined to the joint portion of the divided pipe substantially coaxially with the pipe,
The pipe repair method according to claim 1.
前記補強管を設置する工程は、
前記補強管を長手方向に沿って複数に分割された前記分割管を前記配管へかぶせる手順と、
前記分割管の合わせ部の一つが前記配管の外面から遠ざかるように、前記分割管を前記配管に対して偏軸させて固定する手順と、
前記配管の外面から遠ざけた前記分割管の合わせ部を溶接する手順と、
前記固定手順と前記溶接手順を残りの前記分割管の合わせ部をすべて溶接するまで繰り返す手順と、
前記分割管のあわせ部を溶接した前記補強管を前記配管と略同軸に固定する手順を含んだことを特徴とする、
請求項1に記載する配管の補修方法。
The step of installing the reinforcing pipe includes
A step of covering the pipe with the divided pipe divided into a plurality of the reinforcing pipes along the longitudinal direction;
A procedure for fixing the split pipe to an eccentric axis with respect to the pipe so that one of the mating portions of the split pipe is away from the outer surface of the pipe;
A procedure for welding the joint portion of the divided pipe away from the outer surface of the pipe;
A procedure for repeating the fixing procedure and the welding procedure until all the joint portions of the remaining divided pipes are welded;
Characterized in that it includes a step of fixing the reinforcing pipe welded to the joining portion of the divided pipe substantially coaxially with the pipe,
The pipe repair method according to claim 1.
前記補強管を設置する工程においては、
前記配管に貫通孔が存在する場合に、
前記貫通孔から前記補強管端部への最短距離が以下の式を満たすように前記補強管の位置と長さを設定することを特徴とする、
請求項1から3のいずれかに記載の配管の補修方法。
Figure 2011007306
In the step of installing the reinforcing pipe,
When there is a through hole in the pipe,
The position and length of the reinforcing tube are set so that the shortest distance from the through hole to the reinforcing tube end satisfies the following formula:
The pipe repair method according to any one of claims 1 to 3.
Figure 2011007306
前記配管に貫通孔が存在する場合に、
前記配管の内圧を減じる工程と、
前記貫通孔に栓を打ち込む工程を前記補強管を設置する工程の前段に含むとともに、
前記樹脂を硬化する工程の後に前記配管の圧力を復帰させる工程を含んだことを特徴とする、
請求項1から4のいずれかに記載の配管の補修方法。
When there is a through hole in the pipe,
Reducing the internal pressure of the piping;
Including a step of driving a plug into the through-hole in a previous stage of the step of installing the reinforcing pipe,
Including a step of restoring the pressure of the pipe after the step of curing the resin,
The pipe repair method according to claim 1.
前記配管が上下方向に設置されている場合、前記液状の反応硬化型樹脂を充填する工程において前記補強管の端部に型枠を設置する手順を含むとともに、
前記樹脂の硬化後には、
前記型枠を取り除くとともに、前記樹脂部に前記配管から前記補強管への上から下へ向かって径の大きくなるテーパーを形成させる工程を含むことを特徴とする、
請求項1から5のいずれかに記載する配管の補修方法。
In the case where the pipe is installed in the vertical direction, including a procedure of installing a formwork at an end of the reinforcing pipe in the step of filling the liquid reaction-curable resin,
After curing of the resin,
The method includes removing the mold and forming a taper having a diameter increasing from top to bottom from the pipe to the reinforcing pipe in the resin portion.
The pipe repair method according to any one of claims 1 to 5.
前記配管が横方向に設置されている場合、前記補強管は離間した2以上の穴を有し、一方を充填孔、他方を空気抜き穴とし、
前記反応硬化型樹脂を充填する工程は、前記空気抜き穴を上方に配置させた状態で前記樹脂を前記充填孔から充填する手順を含むことを特徴とした、
請求項1から6のいずれかに記載する配管の補修方法。
When the pipe is installed in the lateral direction, the reinforcing pipe has two or more holes spaced apart, one being a filling hole and the other being an air vent hole,
The step of filling the reaction curable resin includes a step of filling the resin from the filling hole in a state where the air vent hole is disposed above.
The piping repair method according to any one of claims 1 to 6.
JP2009153516A 2009-06-29 2009-06-29 Repairing method for piping Pending JP2011007306A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013218885A (en) * 2012-04-09 2013-10-24 Omron Corp Electromagnetic relay
JP7076026B1 (en) * 2021-03-31 2022-05-26 祥正 河原田 How to repair the existing drainage pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013218885A (en) * 2012-04-09 2013-10-24 Omron Corp Electromagnetic relay
JP7076026B1 (en) * 2021-03-31 2022-05-26 祥正 河原田 How to repair the existing drainage pipe

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